高瓦斯煤层深孔预裂爆破增透数值模拟试验  

Numerical simulation on increase of permeability using deep-hole pre-splitting explosion in coal seam

作　　者：蔡峰[1] 刘泽功[1] 林柏泉[2] 

机构地区：[1]安徽理工大学资管系,安徽淮南232001 [2]中国矿业大学安全工程学院,江苏徐州221100

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第4期513-516,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：国家科技支撑计划基金资助项目(2007BAK28B01);国家科技支撑计划基金资助项目(2007BAK29B06);国家自然科学重点基金资助项目(50534090);安徽省优秀青年基金资助项目(2006jq1059);安徽省高校科技创新团队计划基金资助项目(2006KJ005TD);安徽省自然基金资助项目(050440403)

摘　　要：为了解决高瓦斯低透气性煤层的瓦斯抽放难题,利用数值模拟和现场测试相结合的方法,研究了深孔预裂爆破技术对高瓦斯低透气性煤层的卸压增透效果。研究结果再现了爆破过程中,动压冲击震裂、应力波传播与叠加及爆生气体驱动裂纹扩展的整个过程,分析了爆破孔间距对爆生裂纹和增透效果的影响,提出了高瓦斯低透气性煤层深孔预裂爆破的合理间距,表明深孔预裂爆破技术有效地提高了煤层透气性和瓦斯抽采率。该成果为高瓦斯低透气性煤层的瓦斯抽放提出了解决方案。It is difficult to conduct gas drainage in a high gassy and low permeability coal seam. This paper presents a study to comprehend the performance of increasing permeability by deep-hole pre-splitting explosion using numerical simulation and field measurement. The study reveals the process of explosion, cracking caused by dynamic pressure, stress wave transmission and superposition, and crack propagation driven by explosion gas. Also, the study investigates how the pre-splitting drillhole interval affects the crack generation and the permeability enhancement. Therefore, an optimal pre-splitting drillhole interval is proposed for a high gassy and low permeability coal seam. The study shows that the deep-hole pre-splitting explosion technique can increase coal seam permeability and gas drainage rate. The technique provides a new solution for gas drainage in high gassy and low permeability coal seams.

关 键 词：高瓦斯低透气性煤层 深孔预裂爆破 应力波 裂纹扩展 叠加效应 

分 类 号：TD235.33[矿业工程—矿井建设]